After updating to OSX El Capitan I noticed some troubles with docker-machine connecting to a Docker on an AWS EC2 Ubuntu 15.04 machine. There were quite a few posts expressing the same frustrations.. though few solutions.

Better npm & node_modules

Here's a way to
- Install node packages globally without using sudo
- avoid node-modules sprawl.... by having a single common set of node_modules
- reduce bandwidth by avoiding download the same thing over and over again